7.33. Add Alpha Channel

Add Alpha Channel: An alpha channel is
automatically added into the Channel Dialog as soon as you add a second
layer to your image. It represents the transparency of the image. If your
image has only one layer, this background layer has no Alpha channel. In
this case, you can Add an Alpha channel with this command.

7.33.1. Activate the Command

You can access this command from the image menubar through
Layer → Transparency → Add alpha Channel.

In addition, at the
Layer Dialog, you
can access it through Add Alpha Channel
of its context pop-up menu.